The momentum of the cluster as a whole would not change if there are no external forces on the system, 0 if the net sum, the total external force, is zero.
星云的动量,作为整体是不变的,若无外力作用于系统，如果外力总和为。
NET 4.0 assembly there, then the second process would not be able to run it.
4装配有净，然后第二个过程将无法运行。
NET 4.0 assembly there, then the second process would not be able to run it.
4装配有净，然后第二个过程将无法运行。
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